at a loss Synonyms

stumped at sea nonplussed nonplused bewildered puzzled below cost disoriented troubled thrown stupefied stunned bemused fazed dumbfounded at one's wits' end thrown off balance uncomprehending muddle-headed flummoxed discombobulated clueless at sixes and sevens up a tree taken aback stuck shaken sacrifice confused confounded blank befuddled beaten bamboozled baffled astounded astonished dazed discomfited lost perplexed mystified muddled fuddled flustered floored disconcerted discomposed addled